NAS1351 Datasheet PDF – Socket Head Cap Screw

Posted on April 4, 2025April 7, 2026 by pinout

Part Number: NAS1351

Function: Socket Head Cap Screw

Manufacturer: Aerospace Industries Association

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Description

The NAS1351 is a high-strength socket head cap screw standardized by the Aerospace Industries Association, typically manufactured from alloy or corrosion-resistant steel for demanding mechanical applications. It features UNRF-3A threads and is designed to meet stringent aerospace fastener specifications, including optional self-locking elements with specific head markings. This fastener is widely used in aerospace structures, high-reliability assemblies, and precision mechanical systems.

Features

Socket head cap screw design for high torque applications
Manufactured according to aerospace NAS standards
UNRF-3A thread form for high-strength fastening
Optional self-locking element with six-dot head marking identification
Available in alloy, corrosion-resistant, and heat-resistant steel
Designed for high reliability and structural integrity

Design Notes

Ensure correct torque specification based on material and thread size
Self-locking versions require inspection of head marking (six dots)
Material selection should match environmental and thermal requirements
UNRF threads provide improved fatigue resistance in high-stress joints
Proper lubrication or coating may be required to prevent galling

Typical Circuit Usage

Mechanical fastening in aerospace assemblies
High-strength structural joints
Precision equipment mounting
Vibration-resistant fastening with self-locking variants
High-temperature mechanical assemblies

How to Choose This Part

Select based on required strength and environmental conditions
Choose appropriate material (alloy, stainless, heat-resistant)
Verify thread compatibility (UNRF-3A) with mating components
Determine if self-locking feature is necessary
Consider corrosion resistance and temperature exposure

Applications

Aerospace structural assemblies
Aircraft engine components
Defense and military equipment
High-reliability industrial machinery
Precision mechanical systems

Alternative / Equivalent Products

NAS1352 socket head cap screw (fine thread variant)
MS16995 aerospace socket head screw
AN500 series machine screws
ISO 4762 metric socket head cap screws
ASTM A574 high-strength socket head screws

NAS1351 Datasheet PDF

Z3M Datasheet PDF – 600V, 1A, Triac – STMicro

Posted on April 2, 2025April 6, 2026 by pinout

The Z3M belongs to the Z01 series of TRIACs, designed for low-power AC switching and phase control applications. It is particularly suitable for direct interfacing with logic-level control circuits, including microcontrollers, due to its relatively low gate trigger current.

Function: Triac, 600V 1A, Sensitivity 3mA

Package: SOT-223, SMBflat-3L Type

Manufacturer: STMicroelectronics

See the preview image and the PDF file for more information.

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Z0103MN, Z0103MUF is marked Z3M

Description

The Z01 series is suitable for general purpose AC switching applications. These devices are typically used in applications such as home appliances (electrovalve, pump, door lock, small lamp control), fan speed controllers,… Different gate current sensitivities are available, allowing optimized performance when driven directly through microcontrollers.

Key Features

Bidirectional AC switch (TRIAC)
High blocking voltage: 600V
On-state RMS current: 1A
Low gate trigger current (sensitive gate type)
Suitable for direct MCU drive (with proper resistor network)
Compact package (commonly TO-92 or SOT-223 depending on variant)

Ordering Information

Z3M Features

1. On-state rms current, IT(RMS) 1 A

2. Repetitive peak off-state voltage, VDRM/VRRM 600 or 800 V

3. Triggering gate current, IGT (Q1)3 to 25 mA

Design Considerations

Gate Drive: Can be driven directly by MCU GPIO via resistor (ensure I_GT is met)
Isolation: Use opto-triac (e.g., MOC30xx) for safety in mains applications
Snubber Network: RC snubber (e.g., 100Ω + 100nF) recommended for inductive loads
dV/dt Sensitivity: High dV/dt may cause false triggering → snubber or proper layout required
Thermal: Limited to low-power loads (~100–200W typical depending on cooling)

Selection Guidance

Use Z3M for low-current AC loads (<1A)
Choose higher current TRIAC (e.g., BT136, BTA16) for heavier loads
Select sensitive gate versions for direct MCU interfacing
Ensure adequate voltage margin for mains (600V suitable for 220VAC systems)

Alternative / Equivalent Parts

Z0103 / Z0107 series
BT131 (1A class TRIAC)
MAC97A6
BT136 (higher current alternative)

Typical Applications

Home appliance control (electrovalves, pumps, door locks)
Small lamp dimmers
Fan speed controllers
Heater control (low power)
AC load switching via MCU